[SERVER-20945] CSRS config servers require majority write concern even for local database - MongoDB

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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:
1. Bring up a CSRS replica set of config servers
2. Try to write a document into a collection in the local database with a write concern of w: 1
Sprint:
Sharding B (10/30/15)

CSRS config servers require majority write concern even for local database. For example:

csrs:PRIMARY> use local

switched to db local

csrs:PRIMARY> db.foo.insert({}, {writeConcern: { w: 1}})

WriteResult({

	"writeError" : {

		"code" : 2,

		"errmsg" : "w: 'majority' is the only valid write concern when writing to config server replica sets, got: { w: 1, wtimeout: 0 }"

})

Should an exception be made in terms of the required write concern for the local database?

is duplicated by

SERVER-25204 CSRS config servers require majority write concern even for local database in 3.3.10